Wei Zhang


Postgraduate Research Student
PhD

Academic and research departments

Surrey Institute of Education.

About

My research project

News

In the media

2023 Self-Determination Theory Conference Highlights
Volunteer and Speaker
2023 Self-Determination Theory Conference Highlights

Research

Research interests

Publications

Bowei Li, Jun Deng, K. D. G. Imalka Jayawardena, Xueping Liu, Yuren Xiang, Aobo Ren, Abayomi Titilope Oluwabi, Steven Hinder, Benjamin Putland, John F Watts, Hui Li, Shixuan Du, S Ravi P Silva, Wei Zhang (2023)Unraveling the Degradation Pathway of Inverted Perovskite Solar Cells Based on ISOS-D-1 Protocol, In: Small methods8(2)2300223pp. e2300223-e2300223 Wiley

Perovskite solar cells (PSCs) have shown rapid development recently, whereas nonideal stability remains the chief obstacle toward commercialization. Thus, it is of utmost importance to probe the degradation pathway for the entire device. Here, the extrinsic stability of inverted PSCs (IPSCs) is investigated by using standard shelf-life testing based on the International Summit on Organic Photovoltaic Stability protocols (ISOS-D-1). During the long-term assessment of 1700 h, the degraded power conversion efficiency is mainly caused by the fill factor (53% retention) and short-circuit current density (71% retention), while the open-circuit voltage still maintains 97% of the initial values. Further absorbance evolution and density functional theory calculations disclose that the perovskite rear-contact side, in particular for the perovskite/fullerene interface, is the predominant degradation pathway. This study contributes to understanding the aging mechanism and enhancing the durability of IPSCs for future applications.

X. Liu, Bo Cederwall, Chong Qi, Ramon Alexander Wyss, Özge Aktas, Aysegul Ertoprak, Wei Zhang, Ayse Ataç Nyberg, Torbjörn Bäck, M. Zielinska, et al, Zsolt Podolyak (2022)Evidence for spherical-oblate shape coexistence in Tc-87, In: Physical review. C106(3)034304

Excited states in the neutron-deficient nucleus Tc-87 have been studied via the fusion-evaporation reaction 54Fe(36Ar, 2n1p) Tc-87 at 115 MeV beam energy. The AGATA gamma-ray spectrometer coupled to the DIAMANT, NEDA, and Neutron Wall detector arrays for light-particle detection was used to measure the prompt coincidence of gamma rays and light particles. Six transitions from the deexcitation of excited states belonging to a new band in Tc-87 were identified by comparing gamma-ray intensities in the spectra gated under different reaction channel selection conditions. The constructed level structure was compared with the shell model and total Routhian surface calculations. The results indicate that the new band structure in 87Tc is built on a spherical configuration, which is different from that assigned to the previously identified oblate yrast rotational band.